~cedric/stegano

Added mising command line tools.
fixed case of the module name
fixed includes in pyproject.toml
simplying project root
nose2 replaces nose for the unit tests
Improved code style.
Updated README.
Improved mypy checks
change dir in each tasks
updated documentation
restored export PATH commands
Removed probably useless commands for build.sr.ht
Removed .travis configuration.
installs missing python3.venv
Updated requirements on python version.
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